A participant either must attend the appointment (required participant), may attend (optional participant), or only receives the appointment for their information (no participant).
This field can either be changed manually by the organizer or the participants or it is updated automatically by the participant's mail. Participants can change their own status even if the appointment can otherwise only be changed by the organizer.
This field indicates whether the participant is to be informed by mail about the appointment. The participant's reply then automatically updates their participant status (provided that their mail system supports this function).
Note that appointment invitations for periodic appointments only refer to changes made to the whole appointment or to the removal of the whole appointment. Changes made to an individual instance of the periodic appointment or the addition of an individual instance are not included. The same applies when calendars for which you have maintenance authorization are updated automatically.